It is possible to use two turbines in parallel by using a single compressor and a single combustion chamber. The arrangement for such a system is shown in Fig. 16.34. For 1 kg of air through the compressor, a certain fraction x is required to pass through turbine I in order to drive the compressor. Then (1 − x) kg passes through turbine II to produce the power output. This is advantageous in that the speed of the compressor would not be affected by the load. A further advantage in this respect can be had by the use of two combustion chambers as shown in Fig. 16.35.
In such an arrangement, the inlet temperatures of the two turbines, as well as their speeds, are separately controllable.
Figure 16.34 Two turbine in parallel
Figure 16.35 Two turbines of parallel with two combustion chambers
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